Mathematics, 19.05.2021 20:20 ebookhardt917

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500 hours and a standard deviation of 90 hours. Out of 165 freshly installed light bulbs in a new large building, how many would be expected to last more than 1640 hours, to the nearest whole number?

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The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500 ho...